| using Lucene.Net.Support; |
| using System.Collections.Generic; |
| |
| /* |
| Egothor Software License version 1.00 |
| Copyright (C) 1997-2004 Leo Galambos. |
| Copyright (C) 2002-2004 "Egothor developers" |
| on behalf of the Egothor Project. |
| All rights reserved. |
| |
| This software is copyrighted by the "Egothor developers". If this |
| license applies to a single file or document, the "Egothor developers" |
| are the people or entities mentioned as copyright holders in that file |
| or document. If this license applies to the Egothor project as a |
| whole, the copyright holders are the people or entities mentioned in |
| the file CREDITS. This file can be found in the same location as this |
| license in the distribution. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are |
| met: |
| 1. Redistributions of source code must retain the above copyright |
| notice, the list of contributors, this list of conditions, and the |
| following disclaimer. |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, the list of contributors, this list of conditions, and the |
| disclaimer that follows these conditions in the documentation |
| and/or other materials provided with the distribution. |
| 3. The name "Egothor" must not be used to endorse or promote products |
| derived from this software without prior written permission. For |
| written permission, please contact Leo.G@seznam.cz |
| 4. Products derived from this software may not be called "Egothor", |
| nor may "Egothor" appear in their name, without prior written |
| permission from Leo.G@seznam.cz. |
| |
| In addition, we request that you include in the end-user documentation |
| provided with the redistribution and/or in the software itself an |
| acknowledgement equivalent to the following: |
| "This product includes software developed by the Egothor Project. |
| http://egothor.sf.net/" |
| |
| THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| IN NO EVENT SHALL THE EGOTHOR PROJECT OR ITS CONTRIBUTORS BE LIABLE |
| FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| This software consists of voluntary contributions made by many |
| individuals on behalf of the Egothor Project and was originally |
| created by Leo Galambos (Leo.G@seznam.cz). |
| */ |
| |
| namespace Egothor.Stemmer |
| { |
| /// <summary> |
| /// The <see cref="Reduce"/> object is used to remove gaps in a <see cref="Trie"/> which stores a dictionary. |
| /// </summary> |
| public class Reduce |
| { |
| /// <summary> |
| /// Constructor for the <see cref="Reduce"/> object. |
| /// </summary> |
| public Reduce() { } |
| |
| /// <summary> |
| /// Optimize (remove holes in the rows) the given <see cref="Trie"/> and return the |
| /// restructured <see cref="Trie"/>. |
| /// </summary> |
| /// <param name="orig">the <see cref="Trie"/> to optimize</param> |
| /// <returns>the restructured <see cref="Trie"/></returns> |
| public virtual Trie Optimize(Trie orig) |
| { |
| IList<string> cmds = orig.cmds; |
| IList<Row> rows = new List<Row>(); |
| IList<Row> orows = orig.rows; |
| int[] remap = new int[orows.Count]; |
| |
| Arrays.Fill(remap, -1); |
| rows = RemoveGaps(orig.root, rows, new List<Row>(), remap); |
| |
| return new Trie(orig.forward, remap[orig.root], cmds, rows); |
| } |
| |
| internal virtual IList<Row> RemoveGaps(int ind, IList<Row> old, IList<Row> to, int[] remap) |
| { |
| remap[ind] = to.Count; |
| |
| Row now = old[ind]; |
| to.Add(now); |
| foreach (Cell c in now.cells.Values) |
| { |
| if (c.@ref >= 0 && remap[c.@ref] < 0) |
| { |
| RemoveGaps(c.@ref, old, to, remap); |
| } |
| } |
| to[remap[ind]] = new Remap(now, remap); |
| return to; |
| } |
| |
| /// <summary> |
| /// This class is part of the Egothor Project |
| /// </summary> |
| internal class Remap : Row |
| { |
| /// <summary> |
| /// Constructor for the <see cref="Remap"/> object |
| /// </summary> |
| /// <param name="old">Description of the Parameter</param> |
| /// <param name="remap">Description of the Parameter</param> |
| public Remap(Row old, int[] remap) |
| : base() |
| { |
| foreach (char ch in old.cells.Keys) |
| { |
| Cell c = old.At(ch); |
| Cell nc; |
| if (c.@ref >= 0) |
| { |
| nc = new Cell(c); |
| nc.@ref = remap[nc.@ref]; |
| } |
| else |
| { |
| nc = new Cell(c); |
| } |
| cells[ch] = nc; |
| } |
| } |
| } |
| } |
| } |